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(No Model.) 2 sheets-sheet 1.

E. J. EURMAN.

STEAM GENERATOR.

No. 332,196. PatentedDeo. 8, 1885.

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(No Model.) n 2 sheets-sheet 2.

F. J. FURMAN.

STEAM GENERATOR.

No. 332,196. Patented Deo. 8, 1885.

WlT/'ESSES N. PETERS. Pmwumugnphur. wnmngwn. D. C.

Attorney UNITED STATES PATENT IIIEEICE.

FREDRIO J. FURMAN, OF GENEVA, NEW YORK.

. STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 332,196, dated December8., 1885.

Application filed September 4, 1885. Serial No. 176,134. (No model.)

To LU whom t may concern:

Be it known that I, FREDRic J. FURMAN, a citizen of the United States ofAmerica, re-

siding at Geneva, in the county of Ontario and' use the same, referencebeing had to the accompanying drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

My invention relates to certain new and useful improvements insteamgenerators or low-y pressure boilers,which are adapted to be usedfor generating steam for heating purposes; and my invention consists inthe construction and combination of the parts, as will be hereinafterfully set forth, and specifically pointed out in the claims.

In the accompanying drawings, which illustrate my invention, Figure l isa vertical sectional view of a furnace and steam-generator constructedin accordance with my invention. Fig. 2 is a transverse section taken onthe line y y of Fig. 1. Fig. 3 is also a transverse sectional View takenon the line x :v of Fig. l. Fig. 4 shows detail perspective views of thewater-tubes, and Fig. 5 is a detail perspective view of the damper.

A represents the ash-pit, which is provided at its front with a door, a,above which is a horizontal slot, a', through which passes arod, b,which is attached to the gratel B, for the purpose of shaking saidgrate. The opposite side of the frame of the ash-pit is provided with aframe or casing, C, which extends partially above the plane of theash-pit, and is provided with an opening, c, which is encircled by thechimney C. This portion C adjacent to the upper edge of the ash-pitopens into the ash-pit and above into the body portion of the furnace.On a line with the top plate, d, of the ash-pit the casing C is providedwith a damper, D, which is constructed as shown in Fig. 5, thedamper-plate being provided at its ends with oppositely-curved portions,so that when the damper is turned the opening e may be closed, so thatthe opening above the plate d, which is indicated by the letter e', willconnect directly with the chimney. The ash-pit is also provided with adraft-door, D, by means of which, when the same is opened or closed, thedraft may be regulated.

rlhe plate d rests immediately above the upper edge of the wall of theash-pit, and it is provided with a circular series of perforations, f,adjacent to which are upwardly-pro jecting anges, Within which lies aring having corresponding perforations, said ring being provided at itsfront portion with depending pins, which pass over the bar b, attachedto the grate, so .that when the grate is shaken this ring will be alsomoved, and the dust which may collect thereon will be siftedinto theashpit. The grate-frame is attached to thcinner side of the circularopening which is formed in the plate d, and the grate is hung withinthis frame in the usual manner. Adjacent to the grate-frame, withinwhich is hung the grate B, the plate d is provided with a series ofperforations or recesses, within which will lie projections e, which areformed at the base of closed ends of the tubes E. Asteam-dome andwaterreceptacle, F, is attached to the upper ends of the tubes E E, andsaid receptacle is provided with a central passage-way, through whichthe magazine depends, said magazine being indicated by the letter F, andthe same is provided near its upper end with a horizontal flange, g,which extends around the same and rests upon the upper plate of thereceptacle F. The lower portion of the magazine has attached thereto acasting, the lower edge of which converges or tapers inwardly, saidcasting being indicated by the letter j", and it is provided at one sidewith double walls, which are connected to a pipe, 7L,which extendsupwardly on the inner side of the magazine, said pipe being connected bya tube with an opening, h', in the wall of the ash-pit adjacent to theopening e. The magazine is provided with a suitable cover, which may beeasily removed therefrom for filling the same with coal or other fuel.The outer casing of the stove is covered on its inner side withhre-brick, which rests upon the plate d, and said casing of iirebrickand the outer wall of the furnace are provided with an opening, fi', forinspecting and stirring the fire.

A top plate is securely attached to the fire- IOO brick and outercasing, and is encircled on its opened to allow a full supply of airunder the under side, adjacent to the joint thereof, by a grate, thedamper D being in the position band, t', which will make between thesteamdome and the inner vertical edge of the outer wall a steam and gastight joint, the flange g of the magazine also making a steam and gastight joint between the top plate of the receptacleFand the top plate,G, ofthe furnace, thus providing aspace, H, between the plates,which islled with lire-clay or non-conducting material. The dry steam isconveyed through the pipe h2 to the radiators in the building to beheated. The tubes E, which are located concentrically around themagazine, are pron vided internally with tubes E', of less diameter thanthe openings in the outer tubes, and the bases of these inner tubes arebifurcated, as shown in dotted lines in Fig. 4, so that the water maycirculate freely between the same, and the upper portion of the outertubes is screw-threaded, so that a tight joint can be made between themand the bottom plate of the receptacle F. The inner sides of the tubewhich are adjacent t0 the outer edge of the magazine are beveled, asshown in Fig. 4, so that the coal will feed itself automatically uponthe grate B, and willv not become clogged, as is often the case wherethe walls of the firepot are straight.

I represents tubes which are located at the rear part of the furnace andextend upwardly into the water-receptacle F, said tubes having strips jlocated between the same, so that they will form at the rear of thefurnace a comparatively tight wall, and these tubes are extended' attheir sides, so that the air and products of combustion can pass overthe upper portions of the same. The center tube, I', extends upwardlyinto the water receptacle F, and the water to supply the same is fedthrough this tube. The tubes I, adjacent thereto, are provided at theirlower portions with blowoff cocks la, for withdrawing any sediment fromthe same. It is not necessary to provide the other tubes with theseblow-off cocks, asthe circulation of the water within those forming thesides of' the fire-pot is so great that the sediment will not collecttherein.

The steam,after being generated in the tubes E, passes through the waterin the receptacle and enters the steam-space, out of which it passesthrough the pipe h. The casting f is provided at its lower edge with agroove or recess, f which will collect the gases and convey the same tothe tube h, from whence they are drawn to the ash-pit.

When the boiler and furnace are operating at their full capacity, thedraft door D is shown in Fig. l. The air then passes upward through thefuel and allows the products of combustion to circulate around andbetween the vertical tubes E, said products of combustien passing overthe tops of the shoulders of the tubes I I, and from thence downwardlybehind the same and through the opening e to the chimney. Air will passfrom the ashpit into the opening h', and through. the pipe h upon theupper part of the fuel, so as to furnish the same with a supply of air.

When the damper is closed,the airzfrom the ash-pit will have a directpassage to the chimney, and the gases which may accumulate above thecoal will be drawn through the pipe h into the ash-pit while theproducts of combustion pass, as hereinbefore described, behind the tubesI I-, and around the damper to the chimney.

Ina boiler constructed as hcreinbefore described, as the coal burnsout,.the heat upon the tubes does not vary materially, and the heat willalways be sufficient to keep the steam generating in the boiler.

By having the tube Iextend above the bottorn of the water-receptacle allthe water cannot be drawn from the receptacle.

I claiml. In a'magazine-boiler, the tubes E, beveled on the inner sidebelow the base of the magazine, substantially as shown, and for the ypurpose set forth.

2. In a furnace, a steam-generating device, the base A,constructedsubstantially as shown, and provided with perforations for the receptionof lugs formed upon the ends of the depending tubes E, said tubes beingattached to a water-receptacle which surrounds the upper portion of themagazine F', the tubes I and I', forming a compartment near the rearportion of the outer casing, substantially as shown,and for the purposeset forth.

3. The combination, with the tubes E, beveledl on their inner sidesbelow the base of the magazine, and attached to the water-receptacle,and also provided with central openings, of the inner tubes bifurcatedat their lower portion, substantially as and for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

FREDRIG J. FURMAN.

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